Exporting the default value from a TypeScript declaration file module

Imagine having a declaration file called foo.d.ts:

declare namespace foo {
  interface Bar {
    (): void;
  }
}

declare var foo: foo.Bar;
export default foo;

Upon compilation:

import Foo from './foo';
Foo();

The result is:

"use strict";
var foo_1 = require('./foo');
foo_1["default"]();

However, the code won't execute as expected because foo_1 is being treated as an object with a property default, not as a function. How can we modify it to have foo_1() appear instead of foo_1["default"]()?

Answer №1

Utilize

export = myFunction;

instead of using export default myFunction; within your declaration file

and make sure to use import require while importing:

import MyFunction = require('./myFunction');

Export assignment/import require is a special syntax in TypeScript designed for managing node modules with exports like

module.exports = function someFunction() {}

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